can someone explain to me the solution. I dont understand why they are solving f

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can someone explain to me the solution. I dont understand why they are solving for OH and K and why they are using Ca2+ and not Cl-

3 C http Iwww.chegg.com/homework help/Chemisty o C 6 HouRS-Relaxing piano, vi.. C Chemistry 2nd Edition Tet... x Masteringchemistry: Chapter 17 e Apps emoved while refre... e Apps removed refre. while Chegg Study TEXTBOOK SOLUTIONS EXPERT Q&A; home /study/science chemistry general chemistry /solutions manual chemistry 2nd edition Chemistry (2nd Edition) Show all steps a ON E Chapter 16, Problem 105P Bookmark Chapter 16 A Problem 97P Potassium hydroxide is used to precipitate each of the cations from their respective solution. Determine the minimum concentration of KoH required for precipitation to begin in each case. a. 0.015 M CaCl2 100p b. 0.0025 M Fe (NO3)2 102p c. 0.0018 M MgBr2 104P 105P Step-by-step solution 106P Search 9:43 PM 3/15/2017

Explanation / Answer

It is because the precipitation will occure for Ca (OH)2 : calcium hydroxide. So if we calculate the hydroxide ion concentration , we can find the amount of KOH needed. Chloride ion will remain as such.

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